Hunspell is based on MySpell and works also with MySpell dictionaries.

C++ library under GPL/LGPL/MPL tri-license.

Interfaces and ports: AndroidHunspellService (for Android, based on the Chromium fork of Hunspell), Enchant (Generic spelling library from the Abiword project), XSpell (macOS port, but Hunspell is part of the macOS from version 10.6 (Snow Leopard), and now it is enough to place the Hunspell dictionary files into ~/Library/Spelling or /Library/Spelling for spell checking), Delphi, Java (JNA, JNI), Perl, .NET, .NET Standard, Python, Ruby (1, 2, 3), UNO, RichEdit.